[8.2]Fix incorrect assertion in `BM_VecSimBasics::UpdateAtBlockSize` benchmark

[meiravgri]

backport of #819 to 8.2

conflicts due to diffrences in svs_tiered.h code

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 96.97%. Comparing base (4390716) to head (207f625).

Additional details and impacted files

@@           Coverage Diff           @@
##              8.2     #823   +/-   ##
=======================================
  Coverage   96.97%   96.97%           
=======================================
  Files         126      126           
  Lines        7329     7340   +11     
=======================================
+ Hits         7107     7118   +11     
  Misses        222      222           

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